Tour to the respiratory system
Teacher: There are 2 ways of controlling the breathing rate. First way is the medulla oblongata senses the carbon dioxide levels and sends a message to the lungs and the diaphragm to increase breathing. Second way is the chemo receptors senses oxygen pressure and medulla oblongata triggers the response. There are two types of ventilations. First one is Hypo ventilation where you breathe slowly as there is more carbon dioxide in blood; next one is hyper ventilation where you breathe quickly as you have lees carbon dioxide in the blood. So, are we good with the respiratory system?
Student 1: Yeah. We understand it, but it will be really cool if we can go through an actual respiratory system.
Teacher: Great idea Sarah! We will see.
Teacher: Today we are actually going on a tour to respiratory system as Sarah said. And we are going by our magic school bus.
Teacher: Get ready guys.
(All are getting ready to go!)
(The bus changes into a mini size bus and enters through the principal’s nose)
Teacher: Now we are entering through nostrils. Nostrils take in air.
Student 2: Miss, are these grass like things called ciliated cells?
Ideas for Attention Deficit Children Children whose attention seems to wander or who never seem to "be with" the rest of the class might be helped by the following suggestions. Pause and create suspense by looking around before asking questions. Randomly pick reciters so the children cannot time their attention. Signal that someone is going to have to answer a question about what is being said. ...
Teacher: Yes, It is. Anyone can remember what ciliated cells do?
Student 3: They produce mucous and they sent germs away by avoiding them into the lungs.
Teacher: Yeah. Very nice. These red backgrounds are called turbinates. They warm the air we breathe in. Mucous is a liquid kind of body fluid which takes away germs. Anyone knows why turbinates are red.
Student 1: I think it is because they have capillaries around them.
Teacher: Very good. So here comes the pharynx and pharynx connects throat to mouth and nasal cavity. Anyone can guess what’s coming up?
Student 4: Glottis and it is the opening to the trachea.
Teacher: Exactly and here comes the flap which is called epiglottis. It prevents food from entering the trachea and this is the larynx and it houses the vocal cords. Now we are entering the wind pipe. Another name for this is ….
Student 1: Trachea!
Teacher: Exactly. This is the passage way of air supported by semi circular cartilage rings. Now only we are going to enter the lung. There are two branches which lead towards the lungs. These are called bronchi. Each bronchi divides into small parts which is called bronchioles. Now here we come to the magical place called ALVEOLI!! This is where your gas exchange occurs. These are grape like structures. Can anyone tell me what do alveoli has in order to occur diffusion?
Student 5: Moist environment, One cell thick and … uhh…large surface area.
Teacher: Very good. There are capillaries around alveoli to diffuse oxygen into blood and take out carbon dioxide. As the particles flow from low concentration to high concentration, oxygen will flow towards the capillaries as there is lees concentration of oxygen in blood. Carbon dioxide will diffuse into the alveoli as there is less carbon dioxide concentration in blood. The lung is covered by a double membrane called pleura; it contracts and expands when we breathe. Below the lungs there is a muscular structure to allow better expansion and contraction of lungs. It is called the diaphragm. So when we breathe the diaphragm goes down and the pressure decreases inside the lungs allowing air to rush in to the lungs. The lungs will expand. The external intercoastal muscles will push the ribs upwards while breathing in. During exhalation the lungs will contract. The diaphragm relaxes. The pressure inside the lungs will increase allowing air to rush out. The internal intercoastal muscles will pull the ribs downward.
"Teacher--Student Interactions and Race in Integrated Classrooms" Studies have shown in the past that there is racial bias in classrooms. Many say that African American students are treated more poorly than Caucasian American students. Examples include less student-teacher interaction, less praise given and less help being given to African American students. A recent study showed that ...